sorry if this is a really daft question…
On all 4 of my wheels, 3 of my wheel nuts are 21mm socket size and 1 is 19MM. And looks different. It’s not a locking wheel nut.
(Daft bit)…are the threads going to be all the same size. Does M12 x 1.5 sound familiar? And why is 1 different looking (longer)?
When I looked at replacing them from ones on eBay (new) they all look the same and are the same size…?